Toshiba G7 Series Applications Workbook page 47

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Output types include open collector, open collector with pull-ups & line driver. Open collector types

are low cost, have poor noise immunity & can have a maximum wire length of 10 meters. Line driver

outputs have a high speed response, high noise immunity & can be transmitted over a length of 30

meters. A

differential line driver has two signals for each of the outputs. Each signal has a

compliment or inverse (mirror image) referred to as A not, B not & Z not. These can be transmitted

100 meters. Do not connect A not, B not or Z not together or to the + or- side of DC power.

Open Collector Output

Line Driver

Wiring should be shielded cable & should be run through dedicated harnesses or conduits (not

shared with any other wiring) spaced 12 inches apart. Cable assemblies can be ordered from the

encoder manufacturer. Never connect or disconnect the encoder connector or wiring while the power

is on. Doing so may damage the encoder. Do not ground the encoder through both the machine & the

cable wiring. Connect the shield at the input device only. If the shield is connected at both ends,

grounding problems that degrade system performance will result.

Detailed information can be obtained through encoder manufacturers which include BEI, Dynapar &

Lakeshore among others.

Encoders should be selected for specific applications. However, a general recommendation would be

a 1024 PPR, bi-directional, differential line driver output with an index pulse. Power should be 12 or

15 VDC.

For additional assistance, please contact Toshiba Adjustable Speed Drive Marketing Dept. at (800) 872-2192

H7 series